This species is known only from West Kalimantan in Indonesian Borneo, where it is presently known only from two localities in the middle of the Kapuas River basin: Nanga Sayan (0° 44'S; 111° 40'E), 33km south of Nanga Pinoh; and Sungai Kelawit (0° 37'S; 111° 47'E), in the Melawi River basin, about 1km upstream from Nanga Pintas. It presumably ranges at least a little more widely, but it probably has a restricted distribution (IUCN 2009. IUCN Red List of Threatened Species. Version 2009.1. <www.iucnredlist.org>. Downloaded on 22June 2009).

Habitat

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Both known specimens were collected in clear rocky rivers, about 20-50m wide, under large rocks in midstream within tropical moist forest. The morphology of these frogs and the sites of collection indicate that this species is fully aquatic, and is probably dependent upon clear water with a high oxygen content. Breeding ecology is not known, but it possibly breeds by direct development. It has not been found in open areas outside forest (IUCN 2009. IUCN Red List of Threatened Species. Version 2009.1. <www.iucnredlist.org>. Downloaded on 22June 2009).